U0111 on Volvo: How to Diagnose & Fix
Lost Communication With Battery Energy Control Module "A"
1 Volvo model · 1 documented issue · 1 critical
U0111 on Volvo by model: symptoms, diagnosis and fix
In the XC40 Recharge BEV the Battery Energy Control Module (BECM) supervises the traction pack contactors. A microprocessor fault causes the BECM to reset while driving; on reset it opens the high-voltage contactors as a fail-safe, instantly disconnecting the traction battery from the drive units. The result is an abrupt, total loss of propulsion at speed with no warning — the car coasts, power steering and brake assist remain but regen and drive are gone. This is distinct from the well-known 12V accessory-battery no-start: here the 12V system is fine and the vehicle is already moving. NHTSA campaign 21V109000 covers 2021-2022 XC40 Recharge.
Common Symptoms
- Sudden complete loss of drive power while driving
- Vehicle coasts to a stop with no propulsion
- Red 'stop safely' / propulsion system service warning
- Vehicle restores power after a full shutdown and restart
How to Fix
Free BECM software update at a Volvo dealer under recall 21V109000 (remedy available March 30, 2021). If the fault recurs after the update, the dealer should pull traction-battery fault memory — repeat contactor-open events on updated cars have been traced to a failing BECM or a high-resistance HV connector at the pack rather than software.
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Sources for this issue (1)
U0111 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0111 mean on a Volvo?
U0111 stands for "Lost Communication With Battery Energy Control Module "A"." Sets when a module loses data-bus communication with Battery Energy Control Module 'A' (the high-voltage battery management controller) and no longer receives its expected messages. On Volvo it is documented across 1 model: XC40.
What are the most common causes of U0111?
The most common causes of U0111 are: Open or shorted bus wiring to the battery energy control module, Corroded or loose connector / poor ground, Blown fuse / lost low-voltage power feed, Low 12V battery voltage, Failed battery energy control module. The specific cause varies by vehicle.
How much does it cost to fix U0111 on a Volvo?
Repair costs vary widely with the root cause and Volvo model; each issue on this page carries its own estimate where one is published.
Looking for U0111 on a different make?
View U0111 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.